Decoding the impact flash created by high-velocity impacts PNASNexus
. The initiation conditions are boxed in the figure. In the case of the SS/Al configurations, jet initiation is predicted to occur in the target A,B). However, jet initiation is predicted to occur in the projectile for the Al/SS configurations C,D). The wedge angle between projectile and target surfaces is given by α, and the initiation time is marked by the vertical line.
When SS impacts Al, the jet is predicted to initiate in the target . Note that the jet evolution and associated flash behavior also depend upon the hydrodynamic properties of the non-initiating side . As the jet terminates, the material ejection mechanism transitions to excavation of the impact crater.
In the case of both normal and oblique Al on SS impacts, the jet is predicted to initiate on the projectile side , as opposed to the target side. As such, the material side controlling the trajectories of ejected fragments may effectively switch from projectile to target as early-stage jetting transitions to later-stage crater excavation.
The contrast between continuous and discontinuous jet and ejection behavior could provide a strong signature for future models capable of capturing both multi-phase impact jetting and crater growth phenomena.
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